21181902151404 has 48 divisors (see below), whose sum is σ = 50235379341056. Its totient is φ = 6944788584000.

The previous prime is 21181902151393. The next prime is 21181902151439. The reversal of 21181902151404 is 40415120918112.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67441329 + ... + 67754679.

Almost surely, 2^{21181902151404} is an apocalyptic number.

It is an amenable number.

21181902151404 is an abundant number, since it is smaller than the sum of its proper divisors (29053477189652).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21181902151404 is a wasteful number, since it uses less digits than its factorization.

21181902151404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405766 (or 405764 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 39.

The spelling of 21181902151404 in words is "twenty-one trillion, one hundred eighty-one billion, nine hundred two million, one hundred fifty-one thousand, four hundred four".